Source for drive Pulleys?

[lowndsy]

Hmm. Looking at a bunch of posts on here I think perhaps I have the wrong idea for my wheel set up. It looks like most people are threading into the wheel or using hex fittings on to the shaft ?

I was going for a floating shaft supported by pillow bearings and clamped at both ends with a smooth bore polypropylene castor wheel (already bought) attached to the belt pulley with adhesive, screws and clamps.